Hydrodynamic dispersion of pressure-induced and electroosmotic flow in porous glasses probed by Nuclear Magnetic Resonance

Fluid transport by flow in random porous media is subject to hydrodynamic dispersion. In a series of pulsed field-gradient NMR experiments, we have compared flow induced by pressure gradients on the one hand and by electroosmosis on the other. The media were porous glasses with pore dimensions from...

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Bibliographic Details
Published inDiffusion fundamentals Vol. 7
Main Authors Li, Yujie, Farrherr, German, Kimmich, Rainer
Format Journal Article
LanguageEnglish
Published 01.12.2007
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Summary:Fluid transport by flow in random porous media is subject to hydrodynamic dispersion. In a series of pulsed field-gradient NMR experiments, we have compared flow induced by pressure gradients on the one hand and by electroosmosis on the other. The media were porous glasses with pore dimensions from 1 to 100 μm. With increasing flow rates, a crossover from subdiffusive to superdiffusive mean-squared displacement laws was observed in both cases. This demonstrates the competition between molecular diffusion and convection, and is a typical example of anomalous transport.
ISSN:1862-4138
1862-4138
DOI:10.62721/diffusion-fundamentals.7.150